| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O' Haras Gap | city | Queensland | Australia | -21.40 | 140.06 | 1043 | 0 |
| O' Relly | city | Mayabeque | Cuba | 22.82 | -82.27 | 157 | 5367 |
| O'BLENESS MEMORIAL HOSPITAL | airport | United States | 39.33 | -82.11 | 720 | 0 | |
| O'BRIEN AIRPARK | airport | United States | 32.49 | -96.85 | 650 | 0 | |
| O'BRIEN AIRPARK EAST/WEST | airport | United States | 30.05 | -82.98 | 55 | 0 | |
| O'BRIEN FLYING SERVICE | airport | United States | 30.22 | -93.00 | 26 | 0 | |
| O'Banion Mobile Home Park | city | Arizona | United States | 33.37 | -110.76 | 4189 | |
| O'Bannon | city | Kentucky | United States | 38.29 | -85.51 | 830 | |
| O'Bil Bil | city | Queensland | Australia | -25.52 | 151.22 | 830 | 0 |
| O'Bourke | city | Cienfuegos | Cuba | 22.17 | -80.46 | 26 | 77466 |
| O'Brem | city | Free State | South Africa | -27.67 | 26.12 | 4189 | 411 |
| O'Brian | city | Sides | Haiti | 18.35 | -72.43 | 1669 | 3769 |
| O'Brian Bay | city | British Columbia | Canada | 50.92 | -126.87 | 88 | 9 |
| O'Brien | city | Buenos Aires | Argentina | -34.90 | -60.75 | 203 | 1770 |
| O'Brien | city | Ontario | Canada | 47.68 | -80.73 | 1230 | 0 |
| O'Brien | city | Florida | United States | 30.04 | -82.94 | 59 | |
| O'Brien | city | Kansas | United States | 38.51 | -95.03 | 895 | |
| O'Brien | city | Oregon | United States | 42.07 | -123.70 | 1669 | |
| O'Brien | city | Texas | United States | 33.38 | -99.84 | 1669 | |
| O'Brien | city | Washington | United States | 47.41 | -122.24 | 190 | |
| O'Brien | city | California | United States | 40.81 | -122.32 | 1669 | |
| O'Brien (historical) | city | West Virginia | United States | 39.05 | -80.03 | 1945 | |
| O'Brien's Bridge | city | Clare | Ireland | 52.95 | -9.35 | 36 | 2287 |
| O'Briens | city | Charlotte | St. Vincent & Grenadines | 13.28 | -61.13 | 321 | 16602 |
| O'Briens Corner | city | Massachusetts | United States | 42.09 | -72.64 | 144 | |
| O'Briensbridge | city | Clare | Ireland | 52.75 | -8.50 | 150 | 4186 |
| O'Brion | city | West Virginia | United States | 38.58 | -80.96 | 892 | |
| O'Bryonsville | city | Ohio | United States | 39.13 | -84.46 | 830 | |
| O'CONNOR FIELD | airport | United States | 42.37 | -89.35 | 900 | 0 | |
| O'Callaghansmills | city | Clare | Ireland | 52.84 | -8.69 | 190 | 1424 |
| O'Canas Family Colonia | city | Texas | United States | 26.22 | -97.83 | 49 | |
| O'Connell | city | New South Wales | Australia | -33.53 | 149.73 | 2601 | 110 |
| O'Connell Bridge | city | Kerry | Ireland | 52.18 | -9.54 | 239 | 1922 |
| O'Connell River | city | Queensland | Australia | -20.87 | 148.62 | 944 | 32 |
| O'Conner | city | Tennessee | United States | 36.02 | -85.51 | 1066 | |
| O'Connor | city | Western Australia | Australia | -31.95 | 116.18 | 830 | 7355 |
| O'Connor | city | Nebraska | United States | 41.51 | -98.47 | 1975 | |
| O'Connor Point | city | Ohio | United States | 40.50 | -83.85 | 997 | |
| O'Connors Camp | city | Eastern Cape | South Africa | -30.27 | 28.40 | 5029 | 8735 |
| O'Donnel Housing | city | Tarlac | Philippines | 15.36 | 120.54 | 229 | 19981 |
| O'Donnell | city | Tarlac | Philippines | 15.35 | 120.46 | 406 | 20169 |
| O'Donnell | city | Tarlac | Philippines | 15.36 | 120.54 | 229 | 19981 |
| O'Donnell | city | Ceuta | Spain | 35.88 | -5.33 | 0 | 95312 |
| O'Donnell | city | Pennsylvania | United States | 41.10 | -78.94 | 1669 | |
| O'Donnell | city | Texas | United States | 32.96 | -101.83 | 3349 | |
| O'Donnell | city | Maryland | United States | 39.25 | -76.86 | 403 | |
| O'Donnell Bend | city | Arkansas | United States | 35.80 | -89.80 | 236 | |
| O'Donnell Heights | city | Maryland | United States | 39.28 | -76.54 | 29 | |
| O'Donnell Place | city | Texas | United States | 28.45 | -97.33 | 131 | |
| O'Donoghue | city | Northern Cape | South Africa | -27.87 | 22.74 | 4242 | 52 |
| O'Fallon | city | Illinois | United States | 38.59 | -89.91 | 830 | |
| O'Fallon | city | Missouri | United States | 38.81 | -90.70 | 830 | |
| O'Fallon | city | Missouri | United States | 38.67 | -90.23 | 830 | |
| O'Fallons | city | Nebraska | United States | 41.16 | -101.08 | 2919 | |
| O'Farrell | city | Texas | United States | 33.12 | -94.32 | 380 | |
| O'Farrell Acres Number 1 Colonia | city | Texas | United States | 28.02 | -97.49 | 52 | |
| O'Farrell Acres Number 2 Colonia | city | Texas | United States | 28.03 | -97.56 | 52 | |
| O'Farril | city | Mayabeque | Cuba | 22.88 | -81.75 | 830 | 1793 |
| O'GARA TECH TRAINING FACILITY | airport | United States | 36.57 | -79.20 | 385 | 0 | |
| O'Gorman | city | Lwes | Haiti | 18.57 | -72.15 | 223 | 71285 |
| O'Grabie West | city | Northern Cape | South Africa | -30.58 | 19.93 | 3349 | 0 |
| O'Halloran Hill | city | South Australia | Australia | -35.07 | 138.55 | 830 | 91216 |
| O'Hara | city | Florida | United States | 28.01 | -82.23 | 95 | |
| O'Higgins | city | Buenos Aires | Argentina | -34.58 | -60.70 | 209 | 5961 |
| O'Kean | city | Arkansas | United States | 36.17 | -90.81 | 262 | |
| O'Kuip | city | Northern Cape | South Africa | -25.35 | 20.05 | 3392 | 0 |
| O'Leary | city | Prince Edward Island | Canada | 46.71 | -64.23 | 72 | 1928 |
| O'Leary | city | Georgia | United States | 32.21 | -81.18 | 3 | |
| O'Leary | city | Iowa | United States | 42.71 | -96.06 | 1669 | |
| O'Neal | city | Arkansas | United States | 35.78 | -91.86 | 291 | |
| O'Neal | city | Alabama | United States | 34.85 | -87.04 | 830 | |
| O'Neal | city | South Carolina | United States | 35.01 | -82.28 | 961 | |
| O'Neal | city | Virginia | United States | 38.35 | -78.27 | 830 | |
| O'Neal Place | city | Louisiana | United States | 30.43 | -91.00 | 22 | |
| O'Neals | city | California | United States | 37.13 | -119.69 | 1669 | |
| O'Neals Crossroad | city | Georgia | United States | 33.19 | -85.22 | 830 | |
| O'Neil | city | Florida | United States | 30.62 | -81.51 | 13 | |
| O'Neil | city | Mississippi | United States | 31.30 | -90.88 | 396 | |
| O'Neil | city | Michigan | United States | 44.64 | -85.07 | 1122 | |
| O'Neil (historical) | city | Nevada | United States | 41.78 | -115.02 | 5869 | |
| O'Neil Corners | city | Oregon | United States | 45.27 | -122.66 | 180 | |
| O'Neil Landing | city | New Mexico | United States | 35.87 | -106.80 | 8389 | |
| O'Neil Place | city | California | United States | 39.70 | -122.96 | 4550 | |
| O'Neill | city | Iowa | United States | 42.61 | -90.89 | 853 | |
| O'Neill | city | Nebraska | United States | 42.46 | -98.65 | 1998 | |
| O'Neill | city | Utah | United States | 41.21 | -111.94 | 5052 | |
| O'Neill | city | West Virginia | United States | 39.29 | -80.41 | 1197 | |
| O'Neill's Cross Roads | city | Kildare | Ireland | 53.18 | -6.98 | 400 | 3692 |
| O'Neils | city | Long Island | Bahamas, The | 23.50 | -75.22 | 36 | 71 |
| O'Okiep | city | Northern Cape | South Africa | -29.59 | 17.88 | 3517 | 8827 |
| O'Quinn | city | Texas | United States | 29.82 | -96.97 | 406 | |
| O'RILEY | airport | United States | 42.98 | -74.73 | 700 | 0 | |
| O'Reilly | city | Mayabeque | Cuba | 22.82 | -82.27 | 157 | 5367 |
| O'Reilly | city | Mississippi | United States | 33.67 | -90.73 | 134 | |
| O'Reilly's Fontein | city | North West | South Africa | -26.86 | 24.97 | 4206 | 237 |
| O'Reilly's Pan | city | North West | South Africa | -26.89 | 24.90 | 4189 | 76 |
| O'Reily Estates | city | Georgia | United States | 32.71 | -83.63 | 301 | |
| O'Rouck | city | Nip | Haiti | 18.48 | -73.28 | 52 | 0 |
| O'Ryans Point on Half Moon Lake | city | Florida | United States | 28.10 | -82.55 | 45 | |
| O'SULLIVAN AHP | airport | United States | 35.33 | -120.73 | 250 | 0 | |
| O'TOOLE RANCH | airport | United States | 39.07 | -117.42 | 6520 | 0 | |
| O'a | city | Nusa Tenggara Timur | Indonesia | -8.23 | 124.50 | 0 | 38544 |
| O'etlewwe | city | Sachsen-Anhalt | Germany | 52.09 | 11.12 | 370 | 3725 |
| O'etlä | city | Sachsen-Anhalt | Germany | 52.09 | 11.12 | 370 | 3725 |
| O'gyain | city | Xizang | China | 29.30 | 88.40 | 12729 | 730 |
| O'io | city | Soloman Islands | -9.35 | 161.13 | 16 | 2333 | |
| O'lkhovka | city | Volgogradskaya Oblast' | Russia | 49.86 | 44.56 | 259 | 447 |
| O'o | city | Soloman Islands | -9.57 | 161.52 | 3 | 1515 | |
| O'o | city | Soloman Islands | -9.45 | 161.42 | 19 | 2071 | |
| O'odesi | city | Oromiya | Ethiopia | 3.67 | 38.82 | 4189 | 258 |
| O'odesi | city | Oromiya | Ethiopia | 3.62 | 38.87 | 4189 | 0 |
| O'oka | city | Kanagawa | Japan | 35.41 | 139.60 | 131 | 944938 |
| O'omatawa | city | Soloman Islands | -9.60 | 161.47 | 341 | 3561 | |
| O'oroba | city | Soloman Islands | -8.32 | 159.82 | 0 | 281 | |
| O'risqishloq | city | Qashqadaryo | Uzbekistan | 39.16 | 66.89 | 2509 | 52859 |
| O'rtabo'z | city | Samarqand | Uzbekistan | 39.46 | 66.10 | 1669 | 1788 |
| O'rtaqo'rg'on | city | Navoiy | Uzbekistan | 40.16 | 64.91 | 931 | 3459 |
| O'sh | city | Osh | Kyrgyzstan | 40.52 | 72.81 | 3349 | 201175 |
| O'smat | city | Jizzax | Uzbekistan | 39.74 | 67.64 | 3743 | 4619 |
| O'z | city | Qashqadaryo | Uzbekistan | 38.94 | 66.85 | 2509 | 15171 |
| O'zgarish | city | Namangan | Uzbekistan | 40.83 | 71.49 | 1256 | 15063 |